Pump casing



FIG. 1 is a front and right side perspective view of a pump casing for the new design;

FIG. 2 is a front plan view thereof;

FIG. 3 is a back plan view thereof;

FIG. 4 is a right side plan view thereof;

FIG. 5 is a left side plan view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a top and right side perspective view of the pump casing with arms deployed. 

The ornamental design for a pump casing, as shown and described. 